CN114257923B - Moving iron unit magnetic regulating circuit and device - Google Patents

Abstract

The present invention provides a moving iron unit magnetic adjustment circuit and device, including a magnetizing circuit module, a demagnetizing circuit module, a single-chip control circuit, a host computer, a magnetizing coil, four power tubes and a current regulator; the magnetizing circuit module is connected to one end of the magnetizing coil; the demagnetizing circuit module is connected to the other end of the magnetizing coil; the single-chip control circuit is connected to the magnetizing circuit module and the demagnetizing circuit module, and is connected to the host computer; the current regulator is connected to the single-chip control circuit; the magnetizing circuit module includes a first power supply and a magnetizing current control circuit, and the magnetizing current control circuit is connected between the first power supply and the single-chip control circuit; the demagnetizing circuit module includes a second power supply and a demagnetizing current control circuit; the four power tubes form an H bridge, which are respectively connected to the positive and negative poles of the first power supply and the second power supply, and are used to convert the current direction, and the magnetic ring coil is connected between adjacent power tubes. The moving iron magnetic adjustment circuit and device provided by the present invention can more accurately adjust the magnetization effect of the moving iron unit.

Description

A magnetic adjustment circuit and device for a moving iron unit

Technical Field

The invention relates to a magnetic adjustment circuit and device for a moving iron unit, belonging to the technical field of acoustics.

Background technique

The interior of the moving iron unit is composed of magnets, yokes, coils, vibration plates, sound chambers, etc. After assembly, the sound quality is limited by the assembly process and cannot achieve the best effect. The magnets need to be magnetized and adjusted in the finished product state, and the adjustment process also requires a voltage excitation to the coil. The sound quality is measured and the magnetization size and voltage excitation size are adjusted according to the results until the sound quality is within the qualified range. However, the current moving iron unit magnetic adjustment has the following problems: the magnetization magnetic field is unstable, especially the demagnetization magnetic field is unstable and the resolution is not high; the voltage excitation resolution is not high and fine-tuning is impossible. The current resolution is less than one thousandth. The above two points cause the results of each correction of the moving iron product to fluctuate, and it is impossible to reach the optimal expected value, or it fluctuates around the expected value.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a precisely controllable moving iron unit magnetic tuning circuit and device.

The technical solution adopted by the present invention to solve the technical problem is: a moving iron unit magnetic adjustment circuit, including a magnetizing circuit module, a demagnetizing circuit module, a single-chip control circuit, a host computer, a magnetizing coil, a first power tube, a second power tube, a third power tube, a fourth power tube and a current regulator;

The magnetizing circuit module is connected to one end of the magnetizing coil and is used to magnetize the magnetizing coil;

The demagnetization circuit module is connected to the other end of the magnetization coil and is used to demagnetize the magnetization coil;

The single-chip control circuit is connected to the magnetizing circuit module and the demagnetizing circuit module, and is also connected to the host computer, and is used to receive instructions from the host computer, and control the on-off and output voltage value of the magnetizing circuit module and the demagnetizing circuit module according to the instructions;

The current regulator is connected to the single chip control circuit and is used to adjust the current;

The magnetizing circuit module includes a first power supply and a magnetizing current control circuit, wherein the magnetizing current control circuit is connected between the first power supply and the single-chip control circuit and is used to control the on/off of the first power supply and the output voltage value according to the instruction of the single-chip control circuit;

The demagnetization circuit module includes a second power supply and a demagnetization current control circuit, which is used to control the on/off and output voltage value of the second power supply according to the instructions of the single-chip control circuit;

One end of the first power tube is connected to the positive pole of the second power supply, and the other end is connected to the second power tube; one end of the second power tube is connected to the first power tube, and the other end is connected to the negative pole of the first power supply;

One end of the third IGBT tube is connected to the positive pole of the second power supply, and the other end is connected to the fourth power tube. One end of the fourth power tube is connected to the third power tube, and the other end is connected to the negative pole of the second power supply.

One end of the magnetizing coil is connected between the first power tube and the second power tube, and the other end is connected between the third power tube and the fourth power tube.

The above technical solution also includes a voltage excitation circuit, which is connected to the magnetizing coil, and the current pulse width of the voltage excitation circuit is controlled between 30mS-60mS.

The above technical solution also includes a first current sensor and a second current sensor. The first current sensor is connected to the magnetization circuit module, and the second current sensor is connected to the demagnetization circuit module.

In the above technical solution, the current pulse width of the magnetizing circuit module is controlled between 20mS-100mS, and the current pulse width of the demagnetizing circuit module is controlled between 10mS-20mS.

The single-chip microcomputer control circuit in the above technical solution adopts a 16-bit analog-to-digital conversion module and an analog-to-digital conversion module.

The power tube described in the above technical solution is an IGBT tube.

The present invention also provides a moving iron unit magnetic adjustment device, comprising a moving iron unit, a simulated ear, a simulated ear position adjustment mechanism, a first coil position adjustment mechanism, a second coil position adjustment mechanism, a probe and a probe position adjustment mechanism;

The moving iron unit is installed inside the artificial ear, and the artificial ear position adjustment mechanism is connected to the artificial ear;

The first coil position adjustment mechanism and the second coil adjustment mechanism are symmetrically installed below the artificial ear;

The probe is connected to the probe position adjustment mechanism, and the probe is connected to the moving iron unit in the simulated ear.

There are two probes in the above technical solution, which are respectively connected to two contacts of the moving iron unit.

In the above technical solution, the first coil position adjustment mechanism and the second coil position adjustment mechanism are installed with the above-mentioned moving iron unit magnetic adjustment circuit.

The probe in the above technical solution is connected to a voltage excitation circuit.

The beneficial effects of the present invention are as follows: by inputting current through the magnetizing circuit module and the demagnetizing circuit module, the traditional voltage control is replaced by constant current control, so as to achieve more precise control of the magnetizing magnetic field; in order to achieve precise control of the current, two current sensors are used to provide feedback on the magnetizing magnetic field current and the demagnetizing magnetic field current; the magnetic field adopts wide pulses to reduce the influence of eddy currents, and adopts a 16-bit digital-to-analog conversion module and an analog-to-digital conversion module to improve the resolution; and two symmetrically placed coil adjustment mechanisms are used in the device to improve the symmetry of the magnetic field.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a principle block diagram of a magnetic adjustment circuit of a moving iron unit according to the present invention.

FIG. 2 is a schematic structural diagram of a magnetic adjustment device of a moving iron unit according to the present invention.

Detailed ways

The present invention is further described below in conjunction with the accompanying drawings and embodiments.

The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection/connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

Referring to Figure 1, as shown in the figure, the present invention provides a moving iron unit magnetic adjustment circuit, including a magnetizing circuit module, a demagnetizing circuit module, a single-chip microcomputer control circuit 6, a host computer 7, a magnetizing coil 1, a first power tube, a second power tube, a third power tube, a fourth power tube and a current regulator 8, wherein the power tube is an IGBT tube; the magnetizing circuit module is connected to one end of the magnetizing coil 1 for magnetizing the magnetizing coil 1; the demagnetizing circuit module is connected to the other end of the magnetizing coil 1 for demagnetizing the magnetizing coil 1; the single-chip microcomputer control circuit 6 is connected to the magnetizing circuit module and the demagnetizing circuit module, and is connected to the host computer 7 for receiving instructions from the host computer 7, and controlling the circuit on and off and output voltage value of the magnetizing circuit module and the demagnetizing circuit module according to the instructions, the single-chip microcomputer control circuit 6 adopts a 16-bit analog-to-digital conversion module and an analog-to-digital conversion module, which is more convenient to communicate with the host computer 7; the current regulator 8 is connected to the single-chip microcomputer control circuit 6. The single-chip control circuit 6 is connected to adjust the current; the magnetization circuit module includes a first power supply 3 and a magnetization current control circuit 5, the magnetization current control circuit 5 is connected between the first power supply 3 and the single-chip control circuit 6, and is used to control the on and off and output voltage value of the first power supply 3 according to the instructions of the single-chip control circuit 6; the demagnetization circuit module includes a second power supply 2 and a demagnetization current control circuit 4, which is used to control the on and off and output voltage value of the second power supply 2 according to the instructions of the single-chip control circuit 6; it also includes a first current sensor 9 and a second current sensor 10, the first current sensor 9 is connected to the magnetization circuit module, and the second current sensor 10 is connected to the demagnetization circuit module, the first current sensor 9 and the second current sensor 10 have different detection ranges, the current pulse width of the magnetization circuit module is controlled between 70mS, and the current pulse width of the demagnetization circuit module is controlled between 15mS. One end of the first IGBT tube is connected to the positive pole of the second power supply 2, and the other end is connected to the second IGBT tube. One end of the second IGBT tube is connected to the first IGBT tube, and the other end is connected to the negative pole of the first power supply 3; one end of the third IGBT tube is connected to the positive pole of the second power supply 2, and the other end is connected to the fourth IGBT tube. One end of the fourth IGBT tube is connected to the third IGBT tube, and the other end is connected to the negative pole of the second power supply 2; one end of the magnetizing coil 1 is connected between the first IGBT tube and the second IGBT tube, and the other end is connected between the third IGBT tube and the fourth IGBT tube. Four IGBT tubes form a full bridge to convert the current direction of magnetization and demagnetization. It also includes a voltage excitation circuit, which is connected to the magnetizing coil 1, and the current pulse width of the voltage excitation circuit is controlled at 50mS.

As shown in Figure 2, the present invention also provides a moving iron unit magnetic adjustment device, including a moving iron unit, an artificial ear 11, a artificial ear position adjustment mechanism 12, a first coil position adjustment mechanism 14, a second coil position adjustment mechanism 13, a probe 15 and a probe position adjustment mechanism 16; the moving iron unit is installed inside the artificial ear 11, and the artificial ear position adjustment mechanism 12 is connected to the artificial ear 11; the first coil position adjustment mechanism 14 and the second coil adjustment mechanism 13 are symmetrically installed below the artificial ear 11, and the first coil position adjustment mechanism 14 and the second coil position adjustment mechanism 13 are installed with the moving iron unit magnetic adjustment circuit as described above, and the two symmetrically placed coil adjustment mechanisms can improve the symmetry of the magnetic field; the probe 15 is connected to the probe position adjustment mechanism 16, and the probe 15 is connected to the moving iron unit in the artificial ear 11. There are two probes 15, which are respectively connected to the two contacts of the moving iron unit, and the probe 15 is connected to a voltage excitation circuit for inputting an excitation voltage to the magnetizing coil 1.

The working process of the present invention is as follows: according to the size of the moving iron unit, the position of the simulated ear 11, the distance between the coils and the position of the probe 15 are adjusted by adjusting the precision fine-tuning platform. The key point is that after the moving iron unit is placed between the coil poles, there is a small gap, the target value is 0.2mm, and the moving iron unit cannot be squeezed; pull out the measuring probe 15, place the moving iron unit in the test position, loosen the probe 15 to let its elastic structure and the front end of the probe 15 naturally move forward and fit to the two contacts of the moving iron unit; set a suitable magnetizing current so that the magnetizing magnetic field is greater than 1. 0T, set the excitation voltage to zero, adjust the demagnetization current to 10% output, press the trigger button to implement a small demagnetization current magnetization operation, and gradually increase the demagnetization current according to the sound of the moving iron unit in the simulated ear 11 (audio preamplifier). Normally, the sound effect of the moving iron unit will get better and better; if the demagnetization current is still increased, it will drop again at the highest point of the effect and become worse. At this time, the demagnetization current can be reduced and the excitation voltage can be fine-tuned so that the sound effect of the moving iron unit is the best under a certain demagnetization current and excitation voltage. Then it can be stopped.

For the moving iron units of the same batch, their characteristics are generally consistent. The last magnetic adjustment condition of the previous moving iron unit can be used as the first magnetic adjustment condition of the next moving iron unit for magnetic adjustment, which can save the number of magnetic adjustments and time.

The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims (9)

1. A magnetic adjustment circuit for a moving iron unit, characterized in that it comprises a magnetizing circuit module, a demagnetizing circuit module, a single chip control circuit, a host computer, a magnetizing coil, a first power tube, a second power tube, a third power tube, a fourth power tube and a current regulator; The magnetizing circuit module is connected to one end of the magnetizing coil and is used to magnetize the magnetizing coil; The demagnetization circuit module is connected to the other end of the magnetization coil and is used to demagnetize the magnetization coil; The single-chip control circuit is connected to the magnetizing circuit module and the demagnetizing circuit module, and is also connected to the host computer, and is used to receive instructions from the host computer, and control the on-off and output voltage value of the magnetizing circuit module and the demagnetizing circuit module according to the instructions; The current regulator is connected to the single chip control circuit and is used to adjust the current; The magnetizing circuit module includes a first power supply and a magnetizing current control circuit, wherein the magnetizing current control circuit is connected between the first power supply and the single-chip control circuit and is used to control the on/off of the first power supply and the output voltage value according to the instruction of the single-chip control circuit; The demagnetization circuit module includes a second power supply and a demagnetization current control circuit, which is used to control the on/off and output voltage value of the second power supply according to the instructions of the single-chip control circuit; One end of the first power tube is connected to the positive pole of the second power supply, and the other end is connected to the second power tube; one end of the second power tube is connected to the first power tube, and the other end is connected to the negative pole of the first power supply; One end of the third power tube is connected to the positive pole of the second power supply, and the other end is connected to the fourth power tube; one end of the fourth power tube is connected to the third power tube, and the other end is connected to the negative pole of the second power supply; One end of the magnetizing coil is connected between the first power tube and the second power tube, and the other end is connected between the third power tube and the fourth power tube. 2. A moving iron unit magnetic adjustment circuit according to claim 1, characterized in that it also includes a voltage excitation circuit, the voltage excitation circuit is connected to the magnetizing coil, and the current pulse width of the voltage excitation circuit is controlled between 30mS-60mS. 3. A moving iron unit magnetic adjustment circuit according to claim 1, characterized in that it also includes a first current sensor and a second current sensor, the first current sensor is connected to the magnetization circuit module, and the second current sensor is connected to the demagnetization circuit module. 4. A moving iron unit magnetic adjustment circuit according to claim 1, characterized in that: the current pulse width of the magnetizing circuit module is controlled between 20mS-100mS, and the current pulse width of the demagnetizing circuit module is controlled between 10mS-20mS. 5. The moving iron unit magnetic adjustment circuit according to claim 1 is characterized in that: the single chip control circuit adopts a 16-bit analog-to-digital conversion module and an analog-to-digital conversion module. 6. The moving iron unit magnetic tuning circuit according to claim 1, characterized in that: the power tube is an IGBT tube. 7. A moving iron unit magnetic adjustment device, characterized in that it comprises a moving iron unit, a simulated ear, a simulated ear position adjustment mechanism, a first coil position adjustment mechanism, a second coil position adjustment mechanism, a probe and a probe position adjustment mechanism; The moving iron unit is installed inside the artificial ear, and the artificial ear position adjustment mechanism is connected to the artificial ear; The first coil position adjustment mechanism and the second coil adjustment mechanism are symmetrically installed below the artificial ear; The probe is connected to the probe position adjustment mechanism, and the probe is connected to the moving iron unit in the simulated ear; The first coil position adjustment mechanism and the second coil position adjustment mechanism are installed with the moving iron unit magnetic adjustment circuit as described in any one of claims 1 to 4. 8 . The magnetic adjustment device of a moving iron unit according to claim 7 , wherein there are two probes, which are respectively connected to two contacts of the moving iron unit. 9 . The moving iron unit magnetic adjustment device according to claim 7 , wherein the probe is connected to a voltage excitation circuit.